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nasty-shy [4]
3 years ago
11

N the reaction 2Cu2O(s) → 4Cu(s) + O2(g) how does the oxidation number of the copper atoms change

Chemistry
1 answer:
Usimov [2.4K]3 years ago
8 0

Answer: The oxidation number of Cu decreased

Explanation: In Cu2O equation Cu has an oxidation number of

Cu+1 O-2

then in the product side Cu is represented as a single element.

The rule on oxidation number for an individual element is always O

So Cu has 0 oxidation number.

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six different aqueous solutions are represented in the beakers below, and there total volumes are noted. (a) which solution has
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The molarity of the solutions are as follows:

  • solution B has the highest molarity
  • solutions A, D and F have the same molarity
  • solutions A and C are mixed together have a lower molarity than B
  • solution F and D will have the same molarity
  • Volume of water required to be evaporated is 8.3 mL

<h3>What is molarity of a solution?</h3>

The molarity of a solution is the amount in moles of a substance present in a given volume of solution.

From the image of the solution given:

  • solution B has the highest molarity
  • solutions A, D and F have the same molarity
  • when solutions A and C are mixed, the resulting solution have a lower molarity than B
  • solution F and D will have the same molarity after 75 mL and 50 mL of water are added to each respectively
  • the molarity of B is 12/50 = 4/16.7. Volume of water required to be evaporated = 25 - 16.7 = 8.3 mL

Therefore, the molarity of the solutions depends on the moles of substance present per given volume of solution.

Learn more about molarity at: brainly.com/question/24305514

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6 0
2 years ago
Which one of the following pairs of separation techniques will BOTH separate salt from a mixture of salt and water?
Natali5045456 [20]

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What are the options and i dont know what the options are but if one of them is distilation im 99.9% sure that is the answer.

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Which of these is an example of water in liquid form
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Changing of the physical state of water is not a nuclear reaction. So becoz of that the mass will remain constant without any change.
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3 years ago
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